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Big Data Interview Questions
Questions Answers Views Company eMail

How does a client read/write data in HDFS?

 49

What is the difference between MapReduce engine and HDFS cluster?

 108

Explain NameNode and DataNode in HDFS?

 64

How data or file is read in HDFS?

 49

How is indexing done in HDFS?

 61

What alternate way does HDFS provides to recover data in case a Namenode, without backup, fails and cannot be recovered?

 41

Why HDFS performs replication, although it results in data redundancy?

 152

Why ‘Reading‘ is done in parallel and ‘Writing‘ is not in HDFS?

 39

What are the key features of HDFS?

 48

How can one set space quota in Hadoop (HDFS) directory?

 40

Explain how HDFS communicates with Linux native file system?

 57

If I create a folder in HDFS, will there be metadata created corresponding to the folder? If yes, what will be the size of metadata created for a directory?

 44

Replication causes data redundancy then why is is pursued in HDFS?

 61

What is a block in Hadoop HDFS? What should be the block size to get optimum performance from the Hadoop cluster?

 44

What are the main hdfs-site.xml properties?

 50

Un-Answered Questions { Big Data }

How does impala process join queries for large tables?

45

What is rdd partition?

334

Is it possible to add a parameter while running a saved job?

5

What are the relational operators available related to combining and splitting in pig language?

753

What is SSTable?

92

Give the use of the bootstrap panel.

713

What is the use of hbase hmaster?

153

What port does spark use?

330

what are the basic parameters of a Mapper?

876

What is the difference between External and Internal Table in Hive?

784

What are the different tools used for Ambari monitoring purpose?

59

what does the conf.setMapper Class do ?

871

How to load data into table created in hive ?

749

Explain Machine Learning library in Spark?

303

What does hadoop-metrics.properties file do?

582

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